|THE CRACK IN HIS BUTT,|
AS OPPOSED TO CRACKING HIS BUTT.
(THANKFULLY, NO ONE I KNOW.)
San Geraldo said, "They're crackin' their butts."
San Geraldo laughed.
Then he asked (of course), "What's it supposed to be?"
I explained that I thought he might have combined the expressions, "They're cracking the whip" with "They're breaking their butts." I said that if he had enunciated correctly (i.e., "cracking" as opposed to "crackin'") he might have gotten away with it.